Re: [Lsr] Second Working Last Call for draft-ietf-lsr-flex-algo

[[e-mail]]

Hi,

I have a question/comment.

I think that we all agree that FlexAlgo/Link State computation requires that all node use the same topology to compute their SPF. Otherwise, permanent forwarding loops are probable.

https://datatracker.ietf.org/doc/html/draft-ietf-lsr-flex-algo-16#section-12 says


“ASLA Admin Group Advertisements to be used by the Flexible Algorithm
   Application MAY use either the Administrative Group or Extended
   Administrative Group encodings. »

My reading of the above is that the sender of the attribute is free to advertise either Administrative Groups or Extended Administrative Group encoding (or both).

In order to enforce topology consistency, I’m assuming that there is a non-expressed requirement for the node reading the attribute to be able to read both. (ie. MUST support the reading of both encodings).
Is this a correct assumption?
- if so, could this requirement be written in the document. (If we have to choose one, I’d rather have the “MUST” requirement expressed rather than the “MAY”)
- if not, how is the topology made consistent across all nodes?

Thank you,
Regards,
--Bruno

From: Lsr [mailto:[e-mail]] On Behalf Of Acee Lindem (acee)
Sent: Wednesday, June 16, 2021 4:01 PM
To: [e-mail]
Cc: [e-mail]; Christian Hopps <[e-mail]>; [e-mail]
Subject: [Lsr] Second Working Last Call for draft-ietf-lsr-flex-algo

After the first successful WG last call, the authors discovered that some re-work was needed for OSPF AS External route calculation – specifically with respect to the Flex Algorithm ASBR metrics and calculation. This was fixed and there were clarifications in the IANA section (see versions -14 and -15). The draft has been stable since April and we are now ready to WG last call the updated version.


Without further ado, this begins a 2 week WG Last Call, ending on July 1st, 2021, for draft-ietf-lsr-flex-algo

  https://datatracker.ietf.org/doc/draft-ietf-lsr-flex-algo/

All authors, please indicate by sending an email to the list, whether you aware of any other IPR beyond what is already posted:

  [From https://datatracker.ietf.org/ipr/search/?submit=draft&id=draft-ietf-lsr-flex-algo]

  https://datatracker.ietf.org/ipr/3910/
  https://datatracker.ietf.org/ipr/3248/

Thanks,
Chris & Acee.



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